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Finding the Fourth Proportional to 86,580.90, 129,871.35 and 72,802.80

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Solution

The fourth proportional to 86,580.90, 129,871.35 and 72,802.80 is: 109,204.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,580.90 : 129,871.35 = 72,802.80 : x
  2. Step 2: Convert to fraction form
    86,580.90/129,871.35 = 72,802.80/x
  3. Step 3: Cross multiply
    86,580.90x = 129,871.35 × 72,802.80
  4. Step 4: Simplify right side
    86,580.90x = 9,454,997,919.78
  5. Step 5: Solve for x
    x = 9,454,997,919.78/86,580.90
  6. Step 6: Final answer
    x = 109,204.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.